My schedules have been fluctuating every day, and I've been having a hard time keeping up a constant daily routine.
Regardless, I think positive results can be seen/felt in as littles as 10-15min a day. Just make sure the time you do get, you use it well. That's for me anyway, and I'm just a novice. I know other guys on this board dedicate hour or more daily.
You have to make good use of the time that you DO have.
Also, how important is Penis Enlargement on your heirarchy of life right now? If it's one of your top priorities, and you want to get fast gains, you're going to have to dedicate and put other things aside.